Goetze 651 HNs, Инструкции по сборке и обслуживанию

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www.goetze-armaturen.de Assembly and maintenance instructions - 651
7 Operating mode / Maintenance
Flush the pipe well prior to assembly of the safety valve as welding sputter, hemp,
metal chips etc. cause the valve to leak.
In the event of minor leaks caused by contamination between the sealing surfaces
the valve can be made to blow off through lifting, for cleaning purposes.
If leaks continue:
1. Turn knurled nut in counterclockwise direction to lift the valve.
2. Use a flat wrench (not a pipe wrench) to unscrew the entire upper part including
the diaphragm and seat sealing from the housing.
3. Clean seat and seat sealing with a rag and brush, do not use a scraping tool, file,
screwdriver etc.
4. Screw the upper part back into the housing and tighten loosely.
5. Turn knurled nut in clockwise direction to the stop. The valve operates at the set
pressure again.
In the case of safety valves with a lifting device it is recommended, and in certain
plant-specific cases even stipulated that the valves from time to time must be made
to blow-off by lifting the seal off the seat, in order to assure the correct functioning
of the safety valve.
Safety valves are the ultimate safety device for the tank or system.
They must be able to prevent impermissible overpressure even when all other
upstream control and monitoring equipment fails.
To ensure these functional characteristics safety valves require regular and
recurring maintenance.